<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // 1
      var arr = [
        { label: "男", value: 1 },
        { label: "女", value: 0 },
      ];
      function f(arr) {
        // 写代码，得到
        const arr2 = [];
        arr.forEach((ele) => {
          arr2.push(ele.label);
        });
        return arr2;
      }
      var arr2 = f(arr);
      console.log(arr2);
      // arr2 = ['男', '女']
     
    </script>
  </body>
</html>
